. Bonner zoologische Monographien. Zoology. BONNER ZOOLOGISCHE MONOGRAPHIEN Nr. 52/2004 Dividing Nilotonia into two subgenera groups Comparison between Nilotonia () loricata and Ni- lotonia {Dartia) borneri reveals a series of differences between the tv.^o species. (1) A^. loricata is characterized by an extremely elongated chelicera, by a P2 with a ventral surface without denticles, by a P4 with only very small ventral tubercles, by swimming hairs present on the fourth leg, by extensive secondary sclerotization on the ventral side, and by acetabula of ordinary size, without en- larged bas
. Bonner zoologische Monographien. Zoology. BONNER ZOOLOGISCHE MONOGRAPHIEN Nr. 52/2004 Dividing Nilotonia into two subgenera groups Comparison between Nilotonia () loricata and Ni- lotonia {Dartia) borneri reveals a series of differences between the tv.^o species. (1) A^. loricata is characterized by an extremely elongated chelicera, by a P2 with a ventral surface without denticles, by a P4 with only very small ventral tubercles, by swimming hairs present on the fourth leg, by extensive secondary sclerotization on the ventral side, and by acetabula of ordinary size, without en- larged basal sclerites. (2) TV. borneri is characterized by a sexual dimor- phism in the shape of the second leg, by a chelicera of ordinary length (as shown in Fig. 95), by a palp in which the ventral surface of P2 is denticulate and the tubercles on P4 are well developed, by the absence of swimming hairs, by the absence of secondary scle- rotization, and by the basal sclerites of the acetabula being enlarged, with the two posterior ones fused to each other on each side and carrying acetabula of clearly reduced size. Despite these many differences between the two species, in my opinion there is currently only one fea- ture that allows us to divide the genus Nilotonia in a convincing way into two large groups of subgenera. These are:. FIG. 86. Ventral view of Nilotonia {) loricata (top) [Fig. from Lundblad (194 Id)]. Right coxal groups and GF of Nilotonia {Dartia) boettgeri (bottom) [original drawing from holoty^pe slide, NHB]. 106 (1) the Nilotonia-\]kt subgenera, with medial mar- gins of both C3 and C4 meeting anteriorly from the GF and forming a medial suture line [this rv^pe of coxal organization is found in the subgenera Nilotonia (), TV. {Mamersonia) and TV. {Manotonid}], and: (2) the DartiaAike subgenera, with medial mar- gins of C3 only forming a medial edge in the region anterior to the genital field, as given in Fig. 86 [this t}'-pe of coxal organization is found in the
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