Lanceobostra ornata, Hennemann & Conle, 2024
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publication ID |
https://doi.org/ 10.11646/zootaxa.5444.1.1 |
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publication LSID |
lsid:zoobank.org:pub:5DE4A9DD-99F7-4E23-AD50-58DC491BB75E |
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persistent identifier |
https://treatment.plazi.org/id/6398A4F7-5161-4063-A310-7AE5F11B05B9 |
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taxon LSID |
lsid:zoobank.org:act:6398A4F7-5161-4063-A310-7AE5F11B05B9 |
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treatment provided by |
Plazi |
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scientific name |
Lanceobostra ornata |
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sp. nov. |
Lanceobostra ornata sp. n.
urn:lsid:zoobank.org:act:6398A4F7-5161-4063-A310-7AE5F11B05B9
( Figs. 36D–F View FIGURE 36 , 40K–M View FIGURE 40 , 95D View FIGURE 95 )
HT, ♂: Cerro San Felipe , Oax., Mexico; VII. II.1940 (E. H. Taylor) [ ANSP] .
PT, ♀: About 14 mi. E. of Mitla, Mex. May 5 on tree [ USNM] .
Diagnosis. This distinctive species is well characterised in both sexes. While generally similar to the type-species L. aetolus ( Westwood, 1859) comb. n. in most morphological aspects, ♀♀ may be recognised by the prominent leg armature as described below (likely however to underlie considerable intraspecific variability), large roundly triangular medio-dorsal lobe of the basitarsi, distinct rounded lateral lobe of abdominal tergum VII and heavily, unevenly tubercular meso- and metanotum and basal two abdominal terga. From aetolus they can be frequently separated by the notably longer spines of the praeopercular organ and broader, proportionally shorter anal segment, which has the posterolateral angles much more obtuse and rather rounded than triangular as in aetolus . Moreover, aetolus has a more northern distribution and is restricted to dry semi-desert habitats throughout southern Sonora and Sinaloa in NW-Mexico, while this new species is known from rather tropical habitats in SW-Mexico. The very slender ♂♂ are readily distinguished from all other known species by their distinctive, complex colouration, having the body mostly dull greenish with the bases of all femora black and all legs brown with distinct while annulae ( Fig. 36F View FIGURE 36 ).
Etymology. The name (ornatus lat. = ornate, furnished) refers to the prominently lobate and dentate mid and hind legs of ♀♀ and the for this genus unusually complex colouration of ♂♂. Feminine.
Description. ♀♀ ( Figs. 36D–E View FIGURE 36 ): Large (body length incl. subgenital plate 188.0 mm) and slender species for the genus with a heavily tubercular thorax and a very long, lanceolate subgenital plate and prominent leg ornamentation. General colour of the paratype grey with a slight pinkish to brownish wash, most of the abdomen considerably darkened due to preservation. Thoracic tubercles with the tips dark red. Medio-longitudinal keel of the mesosternum dark orange. Legs faintly annulated with dark greyish brown and pale grey to white. All outer margins of the lobes and teeth of mid and hind legs and all basitarsi dark blackish brown. Eyes dark reddish brown. Antennae dark pinkish brown basally and gradually becoming paler towards the apex.
Head: Elongate-ovoid, some 1.4x longer than wide, broadest behind the eyes with genae gently rounded bat slightly gradually narrowing towards posterior in dorsal aspect; vertex weakly convex with an impressed coronal line, sparsely set with some scattered granules and with a pair of obtusely rounded median tubercles at posterior margin. Genae with a few small granules, roughly arranged in a longitudinal row. Between eyes with two obtusely angular and tubercular swellings. Eyes fairly small, circular in outline, strongly convex and their diameter contained 2.8x in length of genae. Antennae reaching about half way along median segment. Scapus notably compressed dorsoventrally, slightly narrowed towards the base and about 1.8x longer than wide. Pedicellus round in cross-section and roughly half the length of scapus.
Thorax: Pronotum about as long and as wide as posterior portion of head, roundly rectangular in shape almost 1.5x longer than wide and unevenly set with small granules, the largest of which are roughly arranged in two slightly converging, sub-parallel longitudinal rows. Anterior margin with a pair of small tubercles medially. Transverse median sulcus indistinct, straight, short and covering no more than half the width of segment. Mesothorax 7x longer than pronotum, uniform in diameter and just weakly widened posteriorly. Mesonotum with a fine medio-longitudinal carina and unevenly supplied with tubercles of variable sizes; the largest tubercles obtusely spiniform. Close to lateral margins with a fine, granulose longitudinal carina. Metanotum sculptured like mesonotum, one-third of whose length and about 3.3x longer than wide, rectangular. Meso- and metapleurae densely granulose. Meso- and metasternum with a prominent medio-longitudinal keel, which is densely supplied with small granules; surface otherwise sparsely granulose.
Abdomen: Median segment slightly shorter than metanotum, about 3x longer than wide and with the lateral margins gently concave; surface unevenly tubercular like metanotum. Segment II slightly shorter than median segment, II–V increasing and VI–VII decreasing in length with V longest and about 3x longer than wide. II–VI almost uniform in diameter with terga rectangular in dorsal aspect, VII considerably narrower than all previous segments with lateral margins posteriorly deflexed to form a rounded lobe, that ventrally extends by about one-third the height of tergum. Tergum II with a distinct, triangular and acutely pointed, posteriad directed transverse posteromedian lobe; surface otherwise sparsely tubercular but tubercles less pronounced than on thoracic nota. Terga III–VII sparsely and minutely granulose, and with a fine, granulose longitudinal lateral carina parallel to lateral margins; VI and VII somewhat inflated posteromedially. Sterna II–VII sparsely and minutely granulose. Praeopercular organ on VII formed by two very long, spiniform appendages at the posterolateral angles. Tergum VIII somewhat widening towards posterior and about half the length of VII, IX almost quadrate in dorsal aspect and notably shorter than VIII. Anal segment a little longer than IX, the lateral margins somewhat deflexed medially and the posterior half slightly narrowed towards a broadly bilobate and obtusely swollen posterior margin; the outer angles rounded and the dorsal surface with a fine medio-longitudinal carina. Epiproct very small and mostly concealed by anal segment. Cerci short, conical with a fairly blunt tip. Subgenital plate very long and projecting beyond tip of abdomen by combined length of four terminal abdominal terga; narrowly naviculate, canaliculate with the lateral margins almost parallel and the apex narrow but obtuse.
Legs: Of moderate length and rather stocky for the genus with prominent armature on mid and hind legs. Profemora shorter mesothorax, mesofemora slightly longer than metathorax, metafemora reaching about three-quarters the way along abdominal segment IV and metatibiae reaching to posterior of abdominal segment VII. Profemora unarmed. Meso- and metafemora distinctly carinated, the posterodorsal carina with two rounded sub-basal teeth, the two outer ventral carinae with a sub-basal lobe that is indistinct on the anterior carina but much more pronounced and trifid on the posterior carina. Meso- and metatibiae on posterodorsal carina with a very large and almost semi-circular sub-basal lobe and a somewhat smaller, unevenly shaped lobe about one-third before the apex; all four outer carinae somewhat deflexed and sub-undulate at apex of tibia. Meso- and metabasitarsi with a prominent, roundly triangular medio-dorsal lobe; a little longer than following three tarsomeres combined. Probasitarsi missing in the unique specimen at hand.
♂♂ ( Fig. 36F View FIGURE 36 ): Medium sized (body length 106.0 mm) and very slender for the genus with a distinctively complex colouration, club-shaped cerci and almost straight lateral margins of abdominal tergum IX. Body smooth and slightly glossy. General colour of holotype greyish olive with a washed black streak along lateral margins of body. Head brown dorsally and white laterally. Pronotum and all coxae chestnut brown. Meso- and metasternum yellowish medially. The three terminal abdominal segments mostly pale grey with some dark speckles, the poculum rather dark greenish grey and irregularly flecked with brown. Legs greyish mid brown, bases of all femora distinctly black, the profemora with a sub-basal pale cream transverse band, the mesofemora (and possibly also metafemora; regenerated in the holotype) with three and the pro- and mesotibiae with two whitish annulae. Eyes drab. Antennae drab dorsally and dark brown ventrally.
Head: Moderately elongate, sub-cylindrical, broadest at the eyes and distinctly narrowing towards the posterior and only 1.3x longer than wide. Vertex flattened and with a slightly impressed coronal line, otherwise smooth except for two node-like posteromedian tubercles; area between eyes with two shallow swellings and frons with a C–shaped central impression. Eyes large, circular in outline and projecting hemispherical, their diameter contained roughly 1.75x in length of genae. Antennae reaching at least half way along abdominal segment III (tips broken off in the holotype). Scapus increasingly compressed dorsoventrally towards the base, rectangular in dorsal aspect and about 2x longer than wide. Pedicellus round in cross-section, somewhat inflated, sub-spherical and a little more than half the length of scapus. III gradually constricted towards the apex about as long as pedicellus.
Thorax: Pronotum about as long but noticeably narrower than head, basically rectangular with the lateral margins convex in median portion and roughly 1.8x longer than wide; surface smooth. Transverse median sulcus distinctly impressed, straight, somewhat shifted towards the posterior and almost spanning over entire width of segment; anterior margin slightly raised and with a pair of granules medially. Mesothorax 8.7x longer than pronotum, uniform in diameter and with a weakly defined irregular and narrow longitudinal furrow parallel to lateral margins. Metanotum one-third the length of mesonotum. Meso- and metasternum very weakly tectate longitudinally.
Abdomen: Median segment slightly shorter than metanotum and 6x longer than wide. Segment II slightly shorter than median segment, II–VI roughly equal in length and of uniform width, VII about four-fifth the length of preceding segment. II–VI on average 5.5x longer than wide, VII trapezoidal and gradually widening towards the posterior and a little more than half the length of VII; lateral surfaces with an obtuse longitudinal bulge. IX narrowed in posterior portion, the anterior half widened and widest portion of abdomen; lateral margins very slightly deflexed in anterior half and the lateral surfaces with a rather shallow longitudinal bulge. Anal segment obtusely tectate longitudinally the posterior portion narrowed and the posterior margin broadly bilobate ( Fig. 40L View FIGURE 40 ); ventral surfaces of the rounded posterolateral angles densely set with minute dark brown denticles. Epiproct tiny. Vomer greyish ochre with the apical portion reddish, roundly rhomboidal in outline, the ventral surface rather flattened and with about five very distinct, gently curved transverse furrows in the basal half; apex minutely bidentate ( Fig. 95D View FIGURE 95 ). Cerci round in cross-section, club-like and gently arcuate. Poculum moderately convex and cup-shaped, reaching some four-fifth the way along tergum IX and with a rather small but fairly acute conical central protuberance ( Fig. 40K View FIGURE 40 ); the posterior portion keeled longitudinally ( Fig. 40M View FIGURE 40 ) and the posterior margin labiate and curved downwards ( Fig. 40K View FIGURE 40 ).
Legs: All long, slender and entirely unarmed. Profemora slightly longer than mesothorax and mesofemora a very little shorter than mesothorax. Left hind leg missing and right hind leg regenerated in the holotype; the metatibia however notably projecting beyond tip of abdomen. Anterodorsal carina of profemora noticeably raised and lamellate. Basitarsi elongate, slender and longer than remaining tarsomeres combined.
Comments. Eggs unknown.
Table 20: Measurements of Lanceobostra ornata sp. n.
* Leg regenerated
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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