Siagotanyx Ashe, 2005
publication ID |
https://doi.org/ 10.11646/zootaxa.1002.1.2 |
publication LSID |
lsid:zoobank.org:pub:BF168D2B-1024-43FA-BA46-4E14BD5C7DE0 |
DOI |
https://doi.org/10.5281/zenodo.5048606 |
persistent identifier |
https://treatment.plazi.org/id/03E78796-FFE8-FFCF-316C-FB53FB0FCA45 |
treatment provided by |
Felipe |
scientific name |
Siagotanyx Ashe |
status |
gen. nov. |
Siagotanyx Ashe View in CoL , new genus
( Figs. 2 View FIGURE 2 , 14–24 View FIGURES 14–18 View FIGURES 19–24 )
Type Species. Siagotanyx rufa Ashe View in CoL , here designated.
Diagnosis. This genus can be easily recognized by the combination of: 445 tarsal segmentation; the extremely long mandibles with reduced prostheca, without modification to the internal base or molar area ( Fig. 16 View FIGURES 14–18 ); the transverse labrum with anterior margin emarginate medially, greatly reduced setation, but with one pair of anterolateral setae extremely long and whiplike ( Fig. 14 View FIGURES 14–18 ); the distinctive labium ( Fig. 18 View FIGURES 14–18 ), with ligula deeply divided to near base into 2 narrow, widely separated, pointed lobes, 2 discal setae, bases of discal setae widely separated, and wide but poorly defined medial pseudopore field with numerous pseudopores; and relatively short antenna with antennomeres 4 subquadrate and 5–10 transverse ( Fig. 20 View FIGURES 19–24 ).
Description. Body generalized, slender, moreorless parallelsided, moderately flattened. Length 2.3–2.5 mm (known species). Head and prothorax very finely and uniformly covered with fine punctures and short, yellowish microsetae; elytra with moderatesized punctures and uniformly distributed yellowish microsetae; abdominal terga and sterna with longer and more prominent microsetae, uniformly distributed. Body without obvious microsculpture, glossy. Head subquadrate; eyes large, length in dorsal aspect about 0.7 times length of temples behind eye; temples broadly rounded behind eyes to base of head; neck absent; infraorbital carina present, complete, moderately well developed; antennal fossae very near lateral margins of clypeus, separated by lateral margins by less than 1/5 width of fossa. Antenna ( Fig. 20 View FIGURES 19–24 ) moderately short; known species with article 4 subquadrate, 5–10 transverse, 11 slightly shorter than 9 and 10 together.
Labrum ( Fig. 14 View FIGURES 14–18 ) transverse, separated from anterior margin of mentum by broad membranous area; anterior margin emarginate medially; setation reduced except one pair of anterolateral setae very long and whiplike, oriented posteriorly in preserved specimens. Epipharynx as in Fig. 15 View FIGURES 14–18 . Mandibles ( Fig. 16 View FIGURES 14–18 ) with very long, curved and slender apices; right and left similar except right with very slight lobe in position of medial tooth; prostheca reduced with a few small teeth basally and a ciliate margin apically; internal base or molar area not modified into lobe. Maxilla ( Fig. 17 View FIGURES 14–18 ) similar to Eumecognathus except lacinia broader and spines and spinose setae of the inner face of lacinia more densely arranged; maxillary palpi 4articled, similar to that of Eumecognathus . Labium as in Fig. 18 View FIGURES 14–18 ; ligula deeply divided to near base into 2 narrow, widely separated, pointed lobes, about 1/2 length of labial palpus 1; 2 discal setae, bases of discal setae widely separated; medial pseudopore field wide but poorly defined, without numerous pseudopores; lateral pseudopore fields each with setose pore, real pores, and about 13–16 pseudopores. Labial palpi 3articled, first article subequal in length to next 2 together, article 2 and article 1 subequal in length, article 3 with 2 leaflike sensory appendages apically. Mentum as in Fig. 18 View FIGURES 14–18 .
Pronotum transverse, 1.5 times as wide as long in known species; uniformly covered with short, yellowish microsetae, microsetae posteriorly directed in midline and posterolaterally to laterally directed on each side of midline, without conspicuous macrosetae; integument with very slight, weak microsculpture, surface glossy. Hypomera narrowly visible in lateral aspect. Elytra about 1.2 times longer than prothorax; posterolateral margins sinuate. Meso and metasternum as in Fig. 21 View FIGURES 19–24 ; mesosternum faintly carinate medially at base; mesocoxal cavities fully margined behind; mesosternal process long, slender, pointed apically, extended beyond middle of mesocoxal cavities; metasternal process short, acutely rounded apically, not attaining mesosternal process, isthmus moderately long; known species with mesosternal process: isthmus: metasternal process in ratio of 1.7:0.7:0.9. Tarsal segmentation 445.
Abdomen parallelsided, rounded apically. Known species with terga III–IV with moderate, V with slight and VI with inconspicuous transverse basal impressions; uniformly covered with moderately long microsetae. Surface without microsculpture, glossy.
Secondary sexual features: None obvious except males with anterior half of sternum VII with densely arranged micropores, and males with sternum VIII very slightly produced as a triangular lobe.
Etymology. The genus name is derived from the Greek noun “Siagon” (feminine) meaning “jaw” and the Greek verb “tanyo” meaning “stretch out” ( Brown 1956). It refers to the long, slender mandibles that characterize this genus. Gender: feminine.
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.