Research Article |
Corresponding author: Renzo Perissinotto ( renzo.perissinotto@nmmu.ac.za ) Academic editor: Frank Krell
© 2016 Renzo Perissinotto.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Perissinotto R (2016) Description of the female of Haematonotus jenisi Krajcik, 2006 and placement of the species within the genus Atrichiana Distant, 1911 (Coleoptera, Scarabaeidae, Cetoniinae). ZooKeys 561: 39-49. https://doi.org/10.3897/zookeys.561.6136
|
The male of Haematonotus jenisi Krajcik, 2006 was described on the basis of a sole holotype specimen. A number of new specimens have recently been collected from the False Bay area of the iSimangaliso Wetland Park, in northeastern KwaZulu-Natal, including a number of females, thereby allowing the description of this sex for the first time. The new series also reveals that most morphological characters are actually typical for the genus Atrichiana Distant, 1911, rather than Haematonotus Kraatz, 1880. For this reason, it is here proposed that this species be placed within Atrichiana, thus becoming the second species of a genus that was previously regarded as monospecific, represented by the southern African endemic A. placida (Boheman, 1857). Like A. placida, A. jenisi exhibits a remarkable polymorphism, but also sexual dimorphism, particularly expressed at the level of the antennal clubs, which in the male are twice as long as in the female. Unfortunately, all specimens of the recent series were collected dead or drowning on the lake shores and therefore no further information on their life cycle and biology in general could be obtained. It seems that the species may represent a micro-endemism restricted to the Western Shores of Lake St Lucia, with habitat associated to Sand Forest and possibly also Northern Coastal Forest vegetation types.
Scarabaeidae , Cetoniinae , genus Atrichiana, genus Haematonotus, revised status, female description, iSimangaliso Wetland Park, South Africa
Understanding that the emergence of the adults of this species was most likely linked to major rainfall events, dedicated searches were conducted throughout the area during the summer season, immediately after a rain of > 20 mm. It was, however, only in April 2010 that two old dead specimens were found along the drying shores of False Bay, in the northern reaches of Lake St Lucia. It was not clear how long the specimens had been drowned in the lake, as the water at the time was hypersaline (salinity >100) and thus capable of preserving the tissues in relatively good state for a long time. After this, three other specimens were collected between November 2010 and November 2014, all in the same area of False Bay and drowned on the shores of the lake. The specimen collected in November 2013 was still alive, but died within a period of 12 hours. It was only at the beginning of February 2015 that 11 specimens in various states of decomposition were again retrieved from the lake shores of False Bay, in the wake of a rain of 55 mm which fell on January 15. This time, the series exhibited four females and also specimens with different colour patterns, thereby revealing a remarkable variability previously undetected and allowing the full description of the species.
All specimens were collected drowned on the shores of False Bay, Lake St Lucia. Only one male specimen, collected in Nov 2013, was still alive while all other specimens were retrieved in various states of decomposition and immediately placed in ethyl acetate and later in a 10% formalin solution.
The description of morphological characters follows the terminology used by
Repositories are abbreviated as follows: BMPC, Jonathan Ball and Andre Marais Private Collection, Cape Town, South Africa;
Haematonotus jenisi Krajcik, 2006: 15.
Sixteen male and four female specimens. 2 ♂: South Africa, KwaZulu-Natal, False Bay, Lister’s Point, 2 Apr 2010, found dead on lake shores, R. Perissinotto & L. Clennell leg. (RPPC); 2 ♂: same data as above but 3 Dec 2011 (
The summary of characters listed here below and in Table
Key generic characteristics of the genera Haematonotus Kraatz, 1880 and Atrichiana Distant, 1911, with closest matches in A. jenisi (Krajcik, 2006) highlighted in bold.
Haematonotus Kraatz, 1880 | Atrichiana Distant, 1911 |
---|---|
Body velutinous, setose and with cretaceous areas on both dorsum and venter (♂, except nigrito forms); or shiny, asetose and without cretaceous areas (♀) | Body dorsally velutinous and asetose; venter and pygidium shiny with cretaceous spots in both sexes |
Clypeus strongly upturned apically | Clypeus sharply upturned apically (♂) ; or mildly upturned and bilobate (♀) |
Pronotum trapezoid, with strong antescutellar arch and prominent tubercle on anterior margin | Pronotum strongly attenuated forward, with base roundedly trisinuate and anterior margin slightly protruding forward medially |
Scutellum with round punctures denser in basal half and setiferous in ♂ | Scutellum flat and unsculptured |
Elytra with uneven costae raised and entire; with fine and dense sculpture | Elytra with sutural costa roundedly raised, third and fifth less so; with diffuse sculpture |
Pygidium with basal and pre-apical lateral depressions; with bilateral cretaceous spots in ♂ | Pygidium with lateral depressions and cretaceous spots in both sexes (except darkest ♀) |
Mesometasternal process constrained and with protruding convexity | Mesometasternal process laterally expanded and roundedly triangular |
Tarsi of average length | Tarsi elongate, particularly in ♂ |
Protibial denticle of ♂ well-developed, arched and produced forward | Protibial denticle of ♂ extremely reduced and forwardly projected |
Meso- and metatibia with arched, uneven outer carina; weakly trilobed distally, with inner lobe more prominent | Meso- and metatibia with no or poorly developed outer carina and spines |
Metatibial spur moderately ditated in ♀ | Metatibial spurs widely spatulate in ♀ |
Aedeagus with ventral lobes of parameres distally slightly expanded, with small outer hooks and inconspicuous ventral setae | Aedeagus with ventral lobes of parameres wider than dorsal lobes, with short setae ventro-apically |
(Table
Body dorsally velutinous with elytra asetose;
Extreme reduction and forward orientation of protibial denticles in male;
Tarsi generally elongate, particularly in male;
Presence of anterior elevation on pronotum (forming carina and tubercle – closer to Haematonotus);
Presence of white cretaceous spots on venter and pygidium;
Elytra with marked, uneven costae and diffuse sculpture;
Meso- and metatibia with no or poorly developed outer carina and spines, respectively;
Metatibial spurs widely spatulate in female;
Aedeagus with dorsal parameral lobes narrower than ventral and exhibiting short setae ventro-apically.
Species-specific characters (Figures
Antennal clubs twice as long in male compared to female;
Presence of cretaceous spot on each side of anterior pronotal declivity;
Presence of sharp vertical carina leading to tubercle on anterior half of pronotal midline;
Scutellum with narrow depression at middle of apical half.
(Figures
Body: Generally shorter and wider than male; background colour from black or dark green to dark brown with or without obvious maculae or bands (Figure
Head. Black with scattered whitish, long setae and dense round punctures; clypeus slightly upturned, but far less than in male, with depression at center forming two lateral lobes, which together with marked lateral ridges enclose frons into teaspoon-like concavity; frons exhibiting smooth convex ridge at middle, reaching anterior pronotal margin.
Pronotum. Black, brown or dark green, matt with dense round punctures becoming progressively larger from the anterior and lateral margins to the center and posterior margin; anterior and lateral margins bearing thin, long but flattened creamy setae; exhibiting bilateral macula of white tomentum on lateral declivity, approximately at mid length; anterior margin as wide as eyes, but sharply raised with tubercle at center reaching disc as sharp carina; posterolateral angle smoothly rounded, posterior margin markedly sinuate anteriad of scutellum.
Scutellum. Dark green to brown or black; perfectly triangular, with apex slightly rounded; without or with few scattered punctures, mainly along lateral margins; with visible mid-depression on apical half.
Elytron. Exhibiting prominent sutural, discal and lateral costae, with latter two arching markedly towards apical declivity; sparse short creamy setae occurring only on lateral and apical declivities; diffuse crescent to horseshoe sculpture throughout surface, except on costal ridges; colour varying from almost completely black to dark green and even light brown, in latter case with three dark maculae on apical half of elytra.
Pygidium. Dark green to black or brown, with bilateral cretaceous spots drastically reduced or absent; exhibiting short creamy setae near sides and apex; with fine, wrinkled sculpture throughout surface.
Appendages. Antennal clubs reddish brown, of normal length, shorter than pedicel and flagellum combined; pedicel and flagellum with scattered but long, erected creamy setae; protibia broadly expanded, with short and scattered creamy setae, bidentate with apical tooth hypertrophic and falciform; meso- and metatibia with long, dense creamy setae, with no or poorly developed outer carina and spines, respectively; metatibial spurs widely spatulate; profemur, mesepimeron, mesofemur and metafemur all covered with very long creamy setae.
Underside. Shiny black to dark green; creamy, long setae throughout surface, except at center of metasternum and abdominal sternites; mesosternal lobe flat and roundedly expanded; abdominal sternites with visible convexity at center and without any white tomentose markings between midline and lateral margins (Figure
Remarks. Atrichiana jenisi shows a marked sexual dimorphism, with the female exhibiting antennal clubs about half the length of that of its male counterpart and a shorter clypeus, with far less upturned margins than in the male (Figures
It is remarkable that Atrichiana jenisi was discovered only very recently, despite the intensive surveys that have been undertaken historically in the area of the iSimangaliso Park (
Virtually nothing is yet known about the biology of the species, as all specimens known so far have been retrieved dead or drowning on the shores of False Bay in Lake St Lucia (Figures
Adults are most likely unable to feed, as no specimens have been collected either in fruit baited traps, on flowers or sap flows, despite the intense collections that were undertaken in the past 15 years, during the period leading to the proclamation of the Park as a World Heritage Site and afterwards (
It appears that adults are active for a relatively short period of time at the onset of the rainy season, from November to February. Adult emergence is obviously linked to major rainfall events, with all fresh specimens collected immediately or shortly after substantial rain (> 20 mm). For instance, most specimens known so far were collected along the shores of False Bay on the 3rd of February 2015 (Figures
Atrichiana jenisi appears to be an endemic of the Sand Forest, possibly extending into the Northern Coastal Forest vegetation unit (types FOz 8 and FOz 7, respectively, of
The iSimangaliso Wetland Park Authority and Ezemvelo KZN Wildlife are gratefully acknowledged for providing logistical assistance and permits for this study. Thanks also to Lynette Clennell for taking all photos included in the manuscript and to Thobile Ndlovu for providing rainfall data for the area. This work is based on the research supported by the South African Research Chairs Initiative of the Department of Science and Technology (DST) and National Research Foundation (NRF) of South Africa.