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Diversity in the Maxillipede Dentition of Mecistocephalus Centipedes

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Diversity in the Maxillipede Dentition of Mecistocephalus Centipedes Contributions to Zoology, 78 (3) 85-97 (2009) Diversity in the maxillipede dentition of Mecistocephalus centipedes (Chilopoda, Mecisto- cephalidae), with the description of a new species with unusually elongate denticles Lucio Bonato1, 3, Alessandro Minelli2, 4 1, 2 Dipartimento di Biologia, Università degli Studi di Padova, Via Ugo Bassi 58b, I-35131 Padova, Italy 3 E-mail: [email protected] 4 E-mail: [email protected] Key words: Chilopoda, functional morphology, Geophilomorpha, maxillipede, Mecistocephalus, Mecistocephalus megalodon n. sp., predation Abstract among centipedes, geophilomorphs are especially adapted to creep in the interstices of litter and soil. As a contribution to investigate the interspecific diversity in the large Common to all centipedes is the unique functional genus Mecistocephalus Newport, 1843 with respect to these centi- specialisation of the first pair of trunk appendages as pedes’ predatorial role in soil tropical communities, we compared the poisonous, stinging maxillipedes (also called forcip- patterns of maxillipede denticles in 32 species of the genus, and stud- ied all published relevant information. All Mecistocephalus species ules or prehensors), which are used to catch prey as share a conservative pattern of six distinct denticles on the mesal side well as to keep enemies at distance. Maxillipedes of the four articles of each maxillipede. Current views on centipede project forwards from below the head, and are used phylogeny suggest that the basic pattern in Mecistocephalus origi- in grasping, poisoning and manipulating other ar- nated from an ancestral array of fewer denticles, by addition of other thropods, earthworms, and probably a larger array of denticles on the first and fourth articles of the maxillipede. These soil animals (Lewis, 1981; Edgecombe and Giribet, patterns are not affected by sexual dimorphism, and intraspecific 2007). variation for denticle position, size and shape is negligible, but for minor allometry determining a relative increase of the size of some Out of more than two hundred known genera of denticles with respect to the maxillipedes during growth. Species dif- geophilomorph centipedes, Mecistocephalus Newport, fer mainly in size, shape, and orientation of most denticles. Remark- 1843 is one of the richest, comprising more than 130 ably larger and unusually shaped denticles are found in a hitherto named species, but many other species still await de- undescribed species from the Seychelles, which is described in this scription or are expected to be discovered after further paper as M. megalodon n. sp. field research (Bonato et al., 2003). Mecistocephalus represents a well-defined clade, clearly diagnosed by many peculiar morphological traits, including a very Contents broad maxillipede segment and especially the remark- ably elongated maxillipedes (Fig. 1), which distinctly Introduction ........................................................................................ 85 Material and methods ........................................................................ 86 overreach the anterior margin of the head. Mecisto- Results and discussion ....................................................................... 87 cephalus species occur almost exclusively in the tropi- The basic pattern of maxillipede denticles ............................... 87 cal and subtropical regions of Africa, Asia and Oce- Intraspecific variation .................................................................. 89 ania, where they are often dominant in the centipede Interspecific diversity and the unusual pattern of communities of forest soils. Recent taxonomic and maxillipede denticles in M. megalodon n.sp. ........................... 89 faunistic investigations contribute to a more adequate Evolution of maxillipede denticles in the mecistocephalids ... 91 Acknowledgements ........................................................................... 93 understanding of the morphological diversity in the References .......................................................................................... 93 genus (Bonato and Minelli, 2004; Bonato et al., 2004; Appendix 1 ......................................................................................... 95 Uliana et al., 2007). Appendix 2 ......................................................................................... 97 Despite the ecological impact of Mecistocephalus centipedes as predators in many soil communities, our Introduction knowledge is fully speculative with respect to their di- etary spectrum, their predatory behaviour and other Centipedes (Chilopoda) are important predators in biological aspects of their trophic role, as well as with most soil communities throughout the world and, respect to possible differences between species. In- Downloaded from Brill.com09/27/2021 08:47:54AM via free access 86 Bonato & Minelli – Diversity in the maxillipede dentition of Mecistocephalus centipedes Fig. 1. Structure and shape of the maxillipedes in Mecistocephalus: microscopic photograph of the maxillipedes, ventral view, of a specimen of M. marmoratus Verhoeff, 1934 (♂, 50 mm, from Beililungshan, Taiwan, coll. MB), and interpretative line-drawing. Descriptive terms for structural elements are indicated. deed, the interspecific variation in morphological traits adequately only for a small number of species. that are clearly related to the feeding behaviour has not In this paper, we explore the diversity in the ar- been adequately explored and documented. Among rangement, size and shape of the maxillipede denticles these traits is the pattern of the sclerotised projections within the genus Mecistocephalus after comparatively on the mesal side of the maxillipede articles (Fig. 1). examining a significant percentage of the species, as All these projections are here referred to as denticles, well as integrating all available published information irrespective of their shape or size, but have been vari- for all known species. Within this comparative analy- ously called teeth, tubercles, nodes or nodules. Due to sis, we also document a remarkable array of unusually the particular position of the condyles between the ar- elongate denticles in a species recently discovered in ticles, the maxillipedes perform adduction and abduc- the Seychelles, which is described here as new. tion on a sub-horizontal plane only and, as a conse- quence, their mesal denticles are directly involved in the grasping mechanics. Therefore, variation in the Material and methods pattern of denticles is expected to affect prey selection and efficiency in holding prey. For the circumscription and species composition of the Even though the maxillipedes of all known Mecisto- genus Mecistocephalus, we refer to the most recent cephalus species share a common ground structure and comprehensive treatments (mainly Minelli, 2006; up- a quite conserved overall shape, preliminary observa- dated by Uliana et al., 2007, and Bonato and Minelli, tions have disclosed some interspecific variation in the in press). Accordingly, Mecistocephalus is considered arrangement, shape and size of the denticles. Published here to include Brachyptyx Chamberlin, 1920, Dasyptyx information on such diversity is fragmentary and heter- Chamberlin, 1920, Ectoptyx Chamberlin, 1920, For- ogeneous in quality, because only some authors recog- mosocephalus Verhoeff, 1937, Fusichila Chamberlin, nised the interspecific diagnostic value of the pattern of 1953 and Megalacrus Attems, 1953; the identity of all maxillipede denticles (e.g., Crabill, 1970) and therefore these nominal genus-group taxa has been already dis- their aspect has been hitherto described and illustrated cussed (Bonato et al., 2003, 2004; Uliana et al. 2007). Downloaded from Brill.com09/27/2021 08:47:54AM via free access Contributions to Zoology, 78 (3) – 2009 87 We took into account all species currently considered A complete survey of the literature on Mecistocepha- valid within Mecistocephalus (following Minelli, 2006, lus was also performed, in order to retrieve all pub- and subsequent papers). However, we excluded the lished information on the pattern of maxillipede denti- nominal species Mecistocephalus pilosus Wood, 1862, cles of different species, through either descriptions or because its inclusion in the genus Mecistocephalus is illustrations of representative specimens. Information uncertain. based on specimens overtly misidentified (often under Intraspecific variation in the pattern of maxillipede the names M. punctifrons, M. maxillaris or M. insula- denticles, particularly with respect to changes during ris; see Bonato and Minelli, 2004) was considered after growth and inter-individual variation, was tested in emendating the identification whenever possible. two species for which large series of specimens of dif- The evolution of major features in the pattern of ferent body length were available to study, namely M. maxillipede denticles in the family Mecistocephalidae karasawai Uliana, Bonato and Minelli, 2007 (82 was inferred by optimizing selected characters on the specimens, body length 11-55 mm, from Kyushu and only available phylogenetic tree of the family (Bonato Ryukyu islands; collections NSMT and MB; see be- et al., 2003), following the parsimony criterion and ap- low for abbreviations) and M. diversisternus (Silves- plying both AccTran and DelTran options. tri, 1919) (37 specimens, body length 20-55 mm, from For descriptive purposes, we followed the tradition- Honshu, Ryukyu islands,
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