Plutomurus

Barjadze, Shalva, Jordana, Rafael, Baquero, Enrique, Giordano, Rosanna & Soto-Adames, Felipe N., 2018, Two new species of Plutomurus Yosii (Collembola, Tomoceridae) from the Caucasus, Zootaxa 4526 (1), pp. 29-40 : 38

Key to the species of the genus Plutomurus with 3+3 prelabral chaetae

Most characters used to diagnose Plutomurus species are ambiguous and open to interpretation. Only the number of prelabral chaeta is easy to see, discrete, and with insignificant levels of intraspecific variation. As discussed above, under light microscopy it is often difficult to determine the actual number of eyes present, although at least the 2–3 largest eyes are almost always visible. Hence, the key refers only to eyes present or absent.

1 Eyes present (usually 3–6)............................................................................. 2 - Eyes absent......................................................................................... 5 2 Hind tibiotarsus with 1 posterior spine.......................................................... P. kelasuricus - Hind tibiotarsus with 2 posterior spines................................................................... 3 3 Tenent hair capitate; Th. II and Abd. V with 5 (medial & posterior) and 3 (posterior) Mc, respectively............ P. revazi - Tenent hair acuminate; Th. II and Abd. V each with 4 Mc...................................................... 4 4 Abd. IV with 1 large lateral and sometimes a second smaller medial Mc ( Figs 9–10 ).......... P. shuburumensis sp. nov. - Abd. IV with 3 Mc: 1 large lateral and 2 smaller medial Mc ( Fig. 26 )......................... … P. pichkhaiai sp. nov. 5 Tenent hair capitate............................................................................ P. grahami - Tenent hair acuminate.................................................................................. 6 6 Mucro with 1–3 intermediate teeth....................................................................... 7 - Mucro without intermediate teeth........................................................................ 8 7 Mucro with 1 proximal tooth................................................................... P. ehimensis - Mucro with 2 proximal teeth......................................................................... P. gul 8 Tenaculum with 2 chaetae; apical and subapical teeth of mucro truncate................................. P. iwatensis - Tenaculum with 1 chaeta; apical and subapical teeth of mucro rounded........................................... 9 9 Inner edge of hind unguis toothless; unguiculus basally swollen and medially excavated...................... P. eristoi - Hind unguis with 1–3 inner teeth; unguiculus narrower at base than near middle................................... 10 10 Hind tibiotarsus with 1 inner spine; unguiculus inner teeth present............................. … P. orthobalaganesis - Hind tibiotarsus with 2 inner spines; unguiculus inner teeth absent.................................... P. kawasawai

Figures

FIGURE 7–10. Generalized maps of dorsal chaetotaxy in Plutomurus shurubumuensis sp. nov.: 7, Head macrochaetae. A: Anterior; B: interocular; C: postocular; 8, Thoracic segments II–III, mesothoracic collar omitted; 9, Abdominal segments I–V, arrow points at element transformed into macrochaeta in one paratype; 10, Detail of differentiated chaetae on abdominal segment IV. Large black circle represents macrochaeta; empty circles represent mesochaetae; hatched circle (chaeta N2) represents variable meso– or macrochaeta; squares with circles represent bothriothricha; circles with a slash represent pseudopores.

FIGURES 24–26. Plutomurus pichkhaiai sp. nov. 24, Maxillary lamella N5 (bar: 0.01 mm); 25, Dorsal chaetotaxy of thoracic segments. II-III; 26, Dorsal chaetotaxy of abdominal segments I–VI.