This work is a first attempt to integrate into one list and quantify all the known species of Hispaniolan arthropods. It includes all the terrestrial and surrounding marine arthropod species (plus those of Tardigrada and Onychophora) known to me to be reported for the island of Hispaniola until the end of 2007, as well as 158 species that are reported here as new records for the Dominican Republic and the island. A total of 8,237 valid species (6,833 extant and 1,404 fossils) are listed, of which the largest component are the insects (5,676 extant and 824 fossil species). Preliminarily, 2,521 arthropod species (36.9%) are considered to be endemic or unique to Hispaniola. Also 84 species are recognized as introduced. The bibliography complements the taxonomic information and includes over 4,000 titles. Brief annotations are also given on the history of entomology in Hispaniola.

The anareolate New World subfamily Cladomorphinae Bradley & Galil, 1977 is reviewed and keys to the six tribes currently included are presented; these are: Cladomorphini Bradley & Galil, 1977, Cladoxerini Karny, 1923, Cranidiini Günther, 1953, Pterinoxylini n. trib., Hesperophasmatini Bradley & Galil, 1977 and Haplopodini Günther, 1953 rev. stat.. New diagnoses are presented for all these tribes and possible relationships within Cladomorphinae are discusssed. Morphology of the genitalia and egg-structures indicate Cladomorphinae as presently treated to be polyphyletic. Two subordinate groups are recognized within present Cladomorphinae, which differ considerably in numerous morphological characters of the insects and eggs. The first group and here regarded as Cladomorphinae sensu stricto is formed by the mostly South American Cladomorphini + Cranidiini + Cladoxerini, while the second group is formed by the predominantly Caribbean Hesperophasmatini + Pterinoxylini n. trib. + Haplopodini.        Members of the first group (= Cladomorphini sensu stricto) share the dorsally carinate basitarsus in which the two dorsal carinae are melted with another, increasingly elongated gonapophyses VIII of females which are noticeably longer than gonapophyses IX and lamellate as well as strongly displaced medioventral carina of the profemora. Cranidiini + Cladomorphini share the strongly elongated and filiform gonapophyses VIII and presence of gonoplacs in the females, specialized poculum of males and presence of a median line in the eggs. Cranidiini differs from all other tribes of Cladomorphinae by the entirely unarmed legs of both sexes, distinctly broadened and leaf-like body and prominent longitudinal keel of the mesosternum of females, prominently enlarged poculum and spinulose phallus of males as well as the conspicuous narrowing of the posteromedian gap of the internal micropylar plate of the eggs and noticeably separated median line. Cladomorphini is characteristic for the specialized vomer and poculum of males and distinct opercular structures of the eggs. Certain representatives of Cladomorphini indicate relationships to the "Phanocles-group" of Diapheromerinae: Diapheromerini, hence Cladomorphini as presently treated may be paraphyletic. The exclusively South American Cladoxerini (= Baculini n. syn.) differs from the other two tribes of Cladomorphinae sensu stricto by the distinctly serrate profemora of both sexes and conspicuously shortened antennae of females, which consist of less than 30 segments and are much shorter than the profemora in females. Genital morphology, such as the elongated gonapophyses VIII and presence of gonoplacs in females, as well as the lamellate medioventral carina of the profemora indicate close relation to Cladomorphini. Cranidiini appears to be the sister-taxon of Cladomorphini + Cladoxerini. The tribe Baculini Günther, 1953 is synonymised with Cladoxerini (n. syn.), on the basis that the type-genera of both tribes are congeneric, with Baculum Saussure, 1861 being a junior synonym of Clado...

An updated and extensively revised checklist of the arthropods of Hispaniola (Dominican Republic and Haiti) is presented 11 years after the publication of the original in 2008. It integrates and quantifies all the terrestrial and surrounding marine arthropod species (plus those of Tardigrada and Onychophora), reported in the zoological literature for Hispaniola through the middle of 2019.        A total of 9,920 valid species (8,202 extant and 1,718 fossil) are listed, which represents an increase of 1,683 species (1,369 extant and 314 fossil) from the original list. The largest component is Insecta (6,784 extant and 1,136 fossil), including 2,206 extant species of Coleoptera, 1,042 species of Hemiptera, 929 species of Diptera, 913 species of Lepidoptera and 774 species of Hymenoptera.        Emphasis is on reviewing and updating the original list, including all newly recorded taxa and all pertinent taxonomic changes proposed since then. Important corrections have been made, and explanatory notes have been added. For example, multiple authors have confused the Lesser Antillean island of Dominica with the Dominican Republic. This error is much more common in the literature than was initially recognized. Erroneous records attributing species from one island to the other have been identified and corrected. The original spelling of the cricket species Scapsipedus bastardoi Otte & Perez-Gelabert, 2009, dedicated to Dominican biologist Ruth H. Bastardo, is corrected to Scapsipedus bastardoae nom. emend.        High species endemism is typical of the biota of Caribbean islands. In this checklist, a total of 3,161 arthropod species (38.6%) are considered endemic or unique to Hispaniola. Among the speciose groups with higher levels of endemism are the Diplopoda (91.6%), Orthoptera (90.1%), Trichoptera (82.6%), Coleoptera (49.3%) and Araneae (47.5%). Also, a total of 201 arthropod species (174 insects + 27 non-insects) are identified as introduced to the island.        The accompanying bibliography complements the taxonomic information and includes over 5,000 titles.