Streptogonopus Attems, 1914

Dave, Ridham & Sindhav, Gaurang, 2025, A new species of the genus Chondromorpha Silvestri, 1897 and a catalogue of Paradoxosomatidae Daday, 1889 millipedes from Gujarat, India, along with their distributions and ecological perspectives (Diplopoda, Polydesmida, Paradoxosomatidae), Zootaxa 5604 (3), pp. 329-349 : 335

Genus Streptogonopus Attems, 1914

The genus Streptogonopus Attems, 1914 encompasses six distinct species, each with unique geographic distributions and morphological characteristics. The distribution of Streptogonopus species varies across different regions. S. jerdani Pocock, 1892 and S. nitens Attems 1936 are exclusively found in India, while S. phipsoni Pocock, 1892 shows a wider distribution across various oriental regions such as India, Pakistan, Bangladesh and Nepal. Additionally, S. degerboelae Golovatch, 2000 and S. montanus Nguyen et al., 2016 are predominantly found in Southeast Asia, specifically in Thailand and Vietnam, respectively. S. neglectus Jeekel, 2004 was initially described in the East African country Eritrea, but has since also been observed in West African countries like Senegal and Mauritania (GBIF.com). S. phipsoni and S. montanus have been found in high-altitudinal regions ( Nguyen et al. 2016, Golovatch & Martens 2018).

This genus is characterized by distinct morphological features, notably the solenophore and solenomere twisting. Solenomere is sheathed by the solenophore ( Figs 6 , 7 ). Within this genus, two distinct groups can be identified based on the size of their paranota: one group with short or absent paranota, including S. jerdani and S. degerboelae , and the other group with well-developed paranota, comprising the remaining species ( Nguyen et al. 2016).

Two Streptogonopus species have been identified in the Gujarat region of India: S. nitens and S. phipsoni . While S. phipsoni is distributed throughout India, S. nitens was recorded only once at Ahmedabad in 1936 ( Attems 1936), although it is known to inhabit various parts of the Gujarat state.

Figures

FIGURE 6 Streptogonopus nitens Attems, 1936, male A) Frontal view; B) Anterior part of body, lateral view; C) Rings 8–10, dorsal view; D) Anterior left leg I, mesal view; E) Opening of mouth, ventral view; F) Posterior part of body, ventrolateral view; G) Posterior part of body, dorsal view; H) Gonopods, ventral view; I) Posterior part of body, lateral view; J) Gnathochilarium, ventral view; K) Diplosegments 8–10, lateral view; L) Anterior part of body, dorsal view. Scale bars: B, C, G, I, K, L = 2 mm; A, J = 0.5 mm; D, E, F, I = 1 mm; G, H, L = 0.5 mm.

FIGURE 7 Dorsal view of the left gonopod of Streptogonopus phipsoni Pocock, 1892, A) SEM Image Scale bar: 100 µm; B) Line Drawing.