Electrocambalidae, Moritz & Wesener, 2021

Moritz, Leif & Wesener, Thomas, 2021, Electrocambalidae fam. nov., a new family of Cambalidea from Cretaceous Burmese amber (Diplopoda, Spirostreptida), European Journal of Taxonomy 755 (1), pp. 22-46 : 25-26

Electrocambalidae fam. nov.

urn:lsid:zoobank.org:act:C3EA19DA-7BED-407F-BD71-6C17D048E129

Figs 1–5

Type genus

Electrocambala gen. nov.

Diagnosis

The new family Electrocambalidae fam. nov. differs from the suborder Spirostreptidea by the structure of the gnathochilarium, with a separate eumentum and promentum, as well as by the presence of two pairs of gonopods. Electrocambalidae fam. nov. differs from the cambalidean families Choctellidae and Pseudonannolenidae by the presence of well-developed posterior gonopods ( Fig. 1B, G ). The new family differs from the Choctellidae and Iulomorphidae by having distinctly arched metazonites from body ring 6 onwards, and long body rings with a length/diameter ratio> 0.7 ( Fig. 1B–C ). Electrocambalidae fam. nov. differs from the Iulomorphidae by the presence of a relatively large first leg pair in the males ( Figs 1D , 4E ). The new family differs from the families Cambalidae , Cambalopsidae and Pseudonannolenidae (in which ozopores start from body ring 5) by the ozopores starting from body ring 6 ( Figs 1B , 5C ). Electrocambalidae fam. nov. differs from the Cambalidae and Cambalopsidae by the absence of tubercles on the metazonites. Electrocambalidae fam. nov. differs from other species of the order Spirostreptida in the combination of the following characters: (1) leg pair 3 moved anteriad, resulting in a seemingly legless body ring 3 in addition to the legless body ring 4 ( Fig. 1B ), (2) presence of setation on the posterior margin of the metazonites, and (3) pilosity on the head is not restricted to the labrum, but extends further up frontally on the head ( Figs 1D , 3E , 5D ).

Etymology

The family name is derived from the Latin word ʻ electrum ʼ meaning ʻamberʼ and the taxon Cambalidea , to which the studied fossils belong.

Other genera included

Kachincambala gen. nov.

Figures

Fig. 1. Electrocambala ornata gen. et sp. nov., holotype, ♂ (ZFMK-MYR7369). A. Habitus, lateral view, photograph. B. Head and anterior body rings, lateral view, photograph. C. Head and anterior body rings, lateral view, volume rendering. D. Head and anterior body rings, lateral view, drawing. E. Tarsus of midbody leg, photograph. F. Midbody ring, photograph. G. Gonopods, frontal view, segmentation. H. Gonopods, lateral view, segmentation. Abbreviations: ag = anterior gonopod; as = accessory spine; at = antennae; cl = claw; co = collum; cx = coxite; L = leg; la = labrum; md = mandible; mz = metazonite; om = ommatidia; pe = penis; pg = posterior gonopod; pz = prozonite; ta = tarsus; te = telopodite.

Fig. 2. Electrocambala ornata gen. et sp. nov., other material, photographs. A. ♂ (BuB1962). B. ♀ (BuB1825). C. Paratype, ♀ (ZFMK MYR7370).

Fig. 3. Electrocambala cretacea gen. et sp. nov., holotype, ♀ (ZFMK-MYR7370). A. Amber piece, photograph. B. Habitus, lateral view, photograph. C. Head and anterior body rings, lateral view, photograph. D. Telson and posterior body rings, lateral view, photograph. E. Head and anterior body rings, lateral view, drawing. F. Antenna, drawing. G. Midbody leg, drawing. Abbreviations: 57 = body ring 57; as = apical spine; at = antennae; av = anal valve; cl = claw; co = collum; cx = coxa; il = incisura lateralis; L = leg; la = labrum; md = mandible; om = ommatidia; ta = tarsus; te = telson.

Fig. 4. Kachincambala muelleri gen. et sp. nov., holotype, ♂ (ZFMK-MYR10225). A. Habitus, dorsal view, photograph. B. Head and anterior body rings, ventral view, volume rendering. C. Head and anterior body rings, lateral view, volume rendering. D. head, frontal view, volume rendering. E. Head, ventral view, volume rendering. F. Gonopods, frontal view, segmentation. G. Gonopods, lateral view, segmentation. Abbreviations: ag = anterior gonopod; at = antennae; co = collum; cx = coxite; em = eumentum; gn = gnathochilarium; L = leg; la = labrum; ll = lamella limgualis; md = mandible; om = ommatidia; pe = penis; pg = posterior gonopod; pm = promentum; st = gnathochilarial stipes; te = telopodite.

Fig. 5. Kachincambala distorta gen. et sp. nov., holotype, ♂ (ZFMK-MYR7368). A. Amber piece, photograph. B. Head and anterior body rings, lateral view, photograph. C. Head and anterior body rings, lateral view, volume rendering. D. Head, lateral view, drawing. E. Tarsus, drawing. F. Gonopods, anterior view, segmentation. G. Gonopods, lateral view, segmentation. Abbreviations: ag = anterior gonopod; at = antennae; cl = claw; co = collum; cx = coxite; L = leg; la = labrum; md = mandible; om = ommatidia; oz = ozopore; pg = posterior gonopod; ta = tarsus; te = telopodite.